Identifing Rochester injectors

[91AWDAstro]

Well last week the van decided to start running like crap. It seemed like it was missing. Tracked it down to a leaky fuel injector. Even though it's a Holley TBI, it's got Rochester fuel injectors in it. I called Holley and their part number is for a 85lb/hr injector. Being it's a GM injector, I was going to try and find a replacement locally. It has the following numbers on it.
5254 & 5720.

Any one know how to identify or cross to a GM part number on these? :-k